Start by beading the eyes, you'll need four black hama beads for each.
Bead the white around the eyes.
Bead around the eyes with green.
Bead the top of the ghost's head.
Then bead the bottom of the ghost.
Create an outline around the ghost with one line of black beads.
Place one row of transparent beads around the outside and fill in the corners.
Cover with wax paper and use an iron to fuse the beads together.
When cool, place some glue on the back of the coasters and stick on to felt.
Here's the pattern for pacman.
Cut around the coasters.
You're all done!